Oil burner



Feb 14, 1933. w. R. KIEFER 1,897,310

OIL BURNER Filed Jan. 25, 1930 i i f/d V7@ 5 Patented Feb. 14, 1933UNITED STATES PATENT oFFlcE WILLIAM RAY KIEFER, OF ROCKFORD, ILLINOIS,.ASSIGNOR TO SUNDSTRAND ENGI- NEERING COMPANY, OF BOCKFORD, ILLINOIS, ACORPORATION OF ILLINOIS OIL BURNER Application led January 25, 1930.Serial No. 423,303.

The invention relates generally to oil X A burners and more specificallyto the type of oil burners wherein an electric spark ignition device isemployed in connection with a fuel spray.

The general objectof the present invention is to provide an improved andsimplified cil burner wherein the parts are supported in a compact unitof such a nature. that the various parts are more readily accessibleprior practice it is quite diiiicult to remove e them from theiroperative positions. Another object, therefore, of the present inventionis to provide an oil burner in which the nozzle and ignition terminalsare supported close to and in communication with the combustion chamberin such a manner that they may be conveniently removed, adjusted' andreplaced. l f

The fuel nozzle and the ignition terminals kof an oil burner are theparts which require attention most frequently and another obn ject ofthe present invention is to simplify and reduce the time required forinspection and adjustment of these parts through the provision of anovel unitary mounting for the nozzle and-the terminals whereby thesetwo elements may quickly and easily be removed from the burner in thesame operation without destroying the operative relationshiptherebetween and without requiring a large number of mechanical orelectrical connections to be broken.

Another object is to provide an improved oil burner construction whereinthe length of secondary leads between lthe transformer and the ignitionpoints is reduced to the minimum so as to avoid the creation of an undueamount of radio interference.

rfhe above and other objects are attained in the presentembodimentthrough the provision of a substantially .straight draft tube or conduithaving one end adapted to extend into the opening in the combustionchamber and the other or outer end closed by a removable plate, air andoil supply pumps positioned laterally of the draft tube, a transformerwithin the outer end of the conduit adapted to be removed therefromafter the plate has been removed, rigid ignitionleads connected to andprojecting inwardly Vfrom. the transformer, a rigid fuel supply pipeextending inwardly through the' draft tube and carrying a fuel nozzleon'its inner end, and means adjustably connecting the fuel supply pipeto the transformer and to the ignition means so as to form a rigidassembly consisting of the nozzle, the ignition ter- .minals and thetransformer,l which assembly may be removed and replaced as a unit.

Other objects and advantages will become apparent from the followingdescription taken in connection with the accompanying drawing, in which,

Figure 1 is a side elevational View of an `oil burner embodying thepreferred form of Figure 3 is a plan view yof the lgnitionl and fuelnozzle assembly.

Figure 4 is an elevational view of themain frame and draft tube of theburner, the view being taken from the right hand side of the burner asshown in Fig. 1.

For purposes of disclosure, the preferred form of the invention isillustrated in the drawing and will hereinafter be described in detailas applied to a particular form of oil burner, but it is to beunderstood that this disclosure is not intended as a limitation of theinvention to this type of burner, it being contemplated that variouschanges might be made by those skilled in the art -to adapt theinvention to other types of burners. The scope of the invention isdefined by the appended claims.

In the exemplary form herein illustrated 4the invention is applied to aburner in which all of the various parts are mounted in a compact unitwhich may be supported in front of a furnace 10 to supply fuel and airto the combustion chamber 11 of the furnace through an opening 12 in theforward wall thereof. The unitary mounting for the parts is hereinprovided by a laterally extended frame 13 (Figs. 1 and 4) which may besupported in front of the opening 12 by brackets 14 (only one hereinshown) secured to the furnace on opposite sides of the opening 12andtprojecting outwardly from the furnace so that the frame may bemounted on the outer ends of the brackets. When the brackets 14 cannotbe employed or do not provide sufficient support, a standard 14"l may-be placed beneath each end of the frame 13 so as to rest on the oor andsupport the frame.

On the central portion of the frame 13, a blower of air pump 15 ismounted which is adapted to be driven by a motor (not shown) mounted onthe frame 13 on one side of the blower. On the other side of the blowera combined fuel pump and filter device 16 is mounted so as to be drivenfrom the shaft of the blower. Air from the blower 15 is conducted to thecombustion chamber 11 through a draft tube 17, carried by the frame 13and having its inner end projecting into the opening 12 in the forwardwall of the furnace. About the draft tube 17, the opening 12 is closedby a late 12 secured to the wall of the furnace. e draft tube 17 is, inthe present instance, positioned directly beneath thet blower 15 and hasan aperture 17 'L in the upper side thereof communicating with theblower.

The fuel spray means and electric ignition means are, in accordance withthe present invention, mounted in the draft tube 17 and in order thatthey may be readily removed from and replaced in their operativepositions, the draft tube is substantially straight and extends throughthe frame 13 so as to project outwardly beyond the blower 15. The outerend 'of the draft tube 17 is closed by meansof a plate 18 detachablysecured thereto. Thus when the plate 18 has been removed an openin isprovided in the draft tube alined wit the axis of the tube so that anozzle 19 and ignition terminals or points 20 may be moved through theouter end of the draft tube to and from their operative positions (Fig.v1) adjacent to the combustion chamber 11.

lSince the nozzle 19 and the ignition terminals 20 are practicallyinaccessible when they are in their operative positions in the drafttube 17, they are arranged so that relative adjustmentl thereof may bemade before the .f

parts are placed in the draft tube. To this end the nozzle 19 and thespark terminals 20 are preferably secured to each other so as to permitof relative adjustment and are arranged so that the assembly thusprovided ma be removed from the draft tube 17 as a unit through theouter end of the tube. The

mounting of the nozzle 19 and terminals 20 is materially simplified: byproviding a substantially rigid fuel supply pipe 21 and a pair ofsubstantially rigid secondary leads or conductors 22, both theconductors and the pipe being adapted to extend longitudinally throughthe draft tube 17. By this arrangement flexible secondary connectionsare avoided and a potential source of trouble thereby eliminated. Thepipe 21 carries the fuel nozzle 19 at its inner end While the sparkterminals 20 are mounted on the inner ends of the conductors 22 and tomaintain the two terminals and the nozzle in a predetermined relation toeach other, the conductors and the pipe are rigidly b'ut adj ustablyconnected together at longitudinally spaced points. One of theseconnections is provided by a transverse bar 23 having suitably spacedapertures therein through which the conductors 22 and the pipe 2lextend. Insulators 24 are posi tioned about conductors 22 within theapertures in the bar 23 and suitable fastening screws 25 are positionedin the bar 23 so that the pipe and the conductors may be secured againstlongitudinal movement relative to the bar. l

. It has been found that the high tension current in the secondary leadsof an oil burner ignition system creates undesirable radio interferenceand in order to red'uce such interference to the minimum, the secondaryleads must be made as short as possible. This is accomplished in thepresent embodiment by'molmting `a transformer 26 in the enlarged outerend of the draft tube 17 so that the outer ends of the rigid conductors22 may be directly and rigidly connected to the transformer. By thisarrangement the secondary leads as well as the transformer are enclosedso as to avoid possible injury of the operator` by the high tensioncurrent.

As above mentioned, the conductors 22 and the fuel supply pipe 21 areconnected together at longitudinally spaced points and one suchconnection is provided by the bar 23. The other connection is preferablyprovided byy means which includes the transformer 26. For this purpose abracket 27 is adjustably secured upon the top of the transformer by ascrew 27a and the outer end of the fuel supply pipe 21 extends throughan apertured lug 28 formed on the bracket. A screw 29 in the lug 28serves to secure the pipe 21 against longitudinal movement relative tothe transformer. As herein shown, the fuel supply ipe 21 is formed intwo sections connected y elbows 21* in order that the fuel nozzle 19 maybe positioned on the axis of the draft tube 17 The transformer 26, thenozzle 19 and fuel pipe 21 and the conductors 22 and terminals 20therefore form a unitary ignition and fuel supply assembly which mayeasily be removed from the draft tube 17. The sturdil ducto'rs' 22..

ness ndfigiit'yof ythe .,@Ilflhly 91H in# creased Amaterially,byspacing'lthe rigidv conf dl die pipe )21j laterally yfrom each otherjsoastoobtainsomewhatpf a truss action between these members andthetransformer. y Thus` in", the present embodiment the two conductors.-y22 are spaced l,laterally from each other in a horizontal plane beneaththe plane of the vpipe 2l. u

To permit the removal of the ignltlon and fuel supply u outer end ofthefuel supply pipe 21 1s detachably connected to a flexible pipe (Fig. 3)which extends from the fuel pump 16 while the transformer 26 is supplied with low tension current through wires 3l ,detachably connectedthereto and extending from the -d main control mechanism (not shown)mounted in a control box 32 positioned above the outer end of the drafttube 17. Thus, when the pipe 30 and the wires 31 have been disconnectedthe ignition and fuel supply unit may be removed from the draft tube for1nspection or repair. ,lin order that the nozzle 19 may be moreaccurately positioned 1n the inner end of the draft tube 17 means 1spreferably provided for supporting the fuel supply pipe 21 at a pointadjacent to the nozzle.

.. This means in the presentembodiment is in tially straight the form ofan air deector 33 mounted on the fuel supply pipe 21 adjacent to thenozzle and having a plurality of blades arranged to engage the sides ofthe draft tube 17 so as to center the nozzle therein and also to actasan air delecting means to produce a swirllng movement of the air as itpasses into the combustion chamber. I

From the foregoing it will be apparent that the invention provides anoil burner wherein the various elements may be arranged with an unusualcompactness, and may be mounted quite close to a furnace, and that, notwithstanding this compact arrangement, the ignition means and fuelnozzle may readily be removed for adjustment, repair or replacement.Furthermore, it will be seen that the assembly and mounting of theelements of the ignition means in the manner herein shown permitsunusually short secondary leads to be employed whereby the creation ofundue radio interference is avoided.

The use of a draft tube having a substanportion which may be opened atits outer end also contributes to the production of an advantageousburner since it permits the removal of the ignition and fuel supplymeans from the burner assembly at a place easily accessible when theassembly is mounted in position on the furnace, which place, asillustrated, is the rear end of the draft tube, at which place the workof removal may be most easily performed.

It will also be evident that the structural make-up of the burner ismaterially simplified through the use of substantially rigid unit fromthe draft tube 17, the i sides of said tube to Vfuel supply nozzlecarried by and having an inner end adapted to coml munioate withI acombustion chamber and an open outerend, a plate forclosing said outerend, a transformer positionedin the outer end of said draft tube, a pairof substantially rigid conductorsattached-to said transformer andextending longitudinally through said draft tube toward the inner endthereof, spark terminals on the inner ends of said conuctors, a fuelsupply pipe adjustably connected to said transformer and extendinglongitudinally through said draft tube toward the inner end thereof, afuel spray nozzle on the inner end of said pipe, means adjustablyconnecting said conductors and said pipe at a point spaced inwardly fromsaid transformer whereby the relativepositions of said nozzle and sparkterminals may be adjusted, and a deflector mounted on said fuel pipeadjacent said nozzle and engaging the position said nozzle Within saidtube, said transformer, said fuel supply pipe, said nozzle, saidconductors, and said spark terminals being withdrawable from the outerend of unit.

2. An oil burner having, fuel and air supply means, a draft tubeconnected to said air supply means and having a substantially straightportion, the inner end of which is adapted to extend into the combustionchamber of a furnace, said tube having an opening therein spaced fromsaid inner end and substantially alined with said straight portion, atransformer positioned in said draft tube and removable therefromthrough said opening, a pair of substantially rigid conductors fixed toand in electrical connection with said transformer, said conductorsextending in spaced relation to each other longitudinally through saidtube substantially to the inner end thereof, sparktermi.- 11a-ls on theinner ends of said conductors, a

pipe adjustably fuel supply means, said pipe extending from saidtransformer longitudinally through said tube in spaced relation tosaidconductors, a the end of said pipe, and means forming an insulatedadjustable connection between said pipe and said conductors at a pointspaced from said transformer, said transformer, saidv pipe and nozzleand said conductors and terminals being removable as a unit from saiddraft tube through said opening.

3. In an oil burner having fuel and air pumps, the combination of adraft tube having a substantially straight portion adapted incombination,

said draft tube as a to extend into a furnace, said tube being connectedto said air pump and having an opening therein substantially alined withsaid straight portion, a transformer in said tube adjacent to saidopening and adapted to be removed from the tube through said opening,and a Ispray nozzle detachably connected to saidfuel pump and mounted onsaid transformer, ignition terminals carried by said transformeradjacent to said nozzle, said terminals and said, nozzle beingrelatively adjustable and being removable from said tube with saidtransformer.

4. An oil burner comprising, in combination, an air pump, an oil pump, adraft tube connected to said air pump and having a substantiallystraight portion the inner end. of which is adapted'to extend into thecombustion chamber of a furnace, said tube having an openingthereinfspaced from said inner end and substantially alined with saidstraight portion, a transformer positioned in said tube and removablethrough said opening, a fuel spray nozzle detachably connected to saidoil pump and adjustably mounted on said transformer, in spaced relationthereto so as to be positioned adjacent the inner end of said drafttube, ignition terminals connected to said transformer and supportedthereby adjacent to said nozzle, and means connected to said nozzle andslidably engaging the sides of said tube adjacent to said nozzle toposition the nozzle accurately in said tube, said terminals, said nozzleand said means being removable as a unit with said transformer.

5. In an oil burner having a draft tube with a substantially straightportion, the inner end of which is adapted to extend into a combustionchamber, said tube having an opening therein substantially alined withsaid straight portion, a transformer positioned in the outer end of saidtube and removable through said opening, a pair of substantially rigidconductors rigidly connected to the inner side of said transformer so asto receive current therefrom, said conductors extending longitudinallythrough said tube and havin spark terminals on their inner ends, anmeans arranged to support the conductors at points spaced from saidtransformer.

6. An oil burner having, in combination, fuel and air supply means, adraft tube connected to said air supply means and having a substantiallystraight portion, the inner end of which is adapted to extend into thecombustion chamber of a furnace, said tube having an opening thereinspaced from the inner end thereof and substantially alined with saidstraight ortion, a transformer positioned in said tu e, a pair ofsubstantially rigid conductors fixed to'and in electrical connectionwith said transformer, said conductors extending from said transformerlongitudinally of said tube substantially to the inner end of the tuiark terminals on the inner ends of said con uctors, a fuel supply pipedetachably connected to said fuel supply means and mounted on saidtransformer, said pipe extending longitudinally of said tube, and avnozzle carried by said pipe adjacent said terminals, said transformer,said pipe and nozzle, and said conductors and terminals bein removableas a unit from said draft tube t rough said opening.

7. In an oil burner having fuel and air supply means and a draft tubewith an opening therein spaced from its inner end, the combination of atransformer positioned within said draft tube and spaced from the innerend thereof, spark terminals carried by said transformer so as to bepositioned adjacent to the inner end of said tube, and a fuel nozzledetachably connected to said fuel supplymeans and carried by saidtransformer so as to be positioned adjacent to said terminals, saidtransformer, said terminals and said nozzle being removable as a unitfrom vsaid tube through said opening.

In testimony whereof, I have hereunto affixed my signature.

WILLIAM RAY KIEFER.

